Cyttaria is a genus of Nothofagus‑parasitic ascomycetes producing distinctive pitted, gelatinous fruitbodies on woody galls. In New Zealand, represented by Cyttaria gunnii, a conspicuous and unmistakable species of beech forests.

Ascomata: globose, ellipsoid, or club‑shaped; gelatinous to rubbery. Surface marked by regular pits (ostioles), each containing an ascus. Colours range pale cream to yellow to orange, depending on species and maturity. Produced in clusters emerging from woody galls on host branches or trunks. Flesh firm‑gelatinous, becoming softer with age.